Download or read book Truck pavement economic Modeling and In situ Field Test Data Analysis Applications written by Shad M. Sargand and published by . This book was released on 2007 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: A jointed concrete pavement on I-490 near Rochester, NY, was reconstructed using three different dowel bar spacings in eastbound test sections. Two sections in the westbound direction were instrumented to monitor environmental strain, deflections, and pavement temperatures. Monitoring of the westbound sections was conducted at the time of construction, after 28 days of curing, and at various intervals over the next two years. The instrumentation included deep and shallow linear variable differential transducers (LVDTs) to measure displacements in the center and the corners of the slabs, thermocouples at four depths near the center and at one corner of the slab, and vibrating wire strain gages with built-in thermistors in the center and the left wheel path. Air temperature data were also gathered during monitoring periods. Data were taken from the instruments at the time of construction, and at 37 days (after curing), 12 months, 16 months, and 28 months after construction. In addition to instrumentation readings taken over an approximately 24-hour period, each visit included slab shape measurements made with a Dipstick®, and deflections measured with a falling weight deflectometer (FWD) on the westbound sections. The final data collection visit, in October 2004, also included FWD testing and profilometer measurements on the eastbound sections. In measuring the pavement response, the FWD and LVDT data both indicated some loss of support that varied in response to changing temperature conditions. Of the three dowel bar arrangements, the E2 arrangement that used bars with the smallest cross-section and the narrowest spacing had the best load transfer efficiency.
Download or read book Truck pavement economic Modeling and In situ Field Test Data Analysis Applications written by Shad M. Sargand and published by . This book was released on 2006 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary objective of this study was to investigate how base materials should be properly selected for specific types of pavement, not only considering the performance of individual layers but also how they interact in the total pavement structure. Base types considered in this study included granular (GB), lean concrete (LCB), asphalt treated (ATB), cement treated (CTB), and permeable asphalt treated (PATB) bases as constructed under both asphalt concrete (AC) and Portland cement concrete (PCC) pavements. The Long Term Pavement Performance (LTPP) Seasonal Monitor Program (SMP) sites investigated for this report included four SMP sections in the North Carolina SPS-2 experiment on US 52 and thirteen SMP sections in the SPS-1 and SPS-2 experiments on the Ohio SHRP Test Road US 23. The NC site contained two GB and two LCB sections, and the OH site contained eight GB, one ATB, two PATB, and two LCB sections. The NC sites are located in a wet-no-freeze zone and OH sites are located in a wet-freeze zone. Environmental data were collected via seasonal monitors and time domain reflectometry. The effects of service were measured by conducting surface profiles and falling weight deflectometer (FWD) measurements. It was found that the type of base had little impact on subgrade moisture. The choice of base depends chiefly on three requirements: appropriate stiffness, sufficient permeability, and good constructability. Guidelines for the selection of base under flexible and rigid pavements are given.
Download or read book Truck pavement economic Modeling and In situ Field Test Data Analysis Applications written by Shad M. Sargand and published by . This book was released on 2006 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work is conducted to provide a complete verification and validation of four different finite element programs (ISLAB2000, JSLAB, EVREFE, and OU3D) for rigid pavement. The experimental data used in this process was collected from the Ohio SHRP Test Road (including four core sections with various geometry and pavement layers) and the Ohio University Accelerated Pavement Load Facility (three different loading conditions). The variety of the pavement sections and loading conditions makes this verification a complete and unique study. The verification outcomes are applied to optimize the joint spacing for least critical stresses within the pavement design life by using three concrete fatigue models (PCA, Huang, and Domenichini). The validation results show that the finite element models follow the general trend of the experimental data in strain, deflection, and vertical pressure. However, two issues are pointed out: stress reversals between the truck axle loads, and slab rocking. Experimental results show that moisture loss that occurred after placing concrete slabs produces a residual negative temperature gradient of -2.2oF/inch ( -0.48C°/cm). This leads to a permanent loss of support (LOS) under the pavement corners. Thus, positive gradient-based curling will only reduce the amount of LOS without eliminating it. When tested under different loading conditions, ISLAB2000 shows some inaccuracy in modeling the joints under combined traffic and environmental loadings. With the presence of built-in negative temperature gradient due to the curing of concrete, the critical tensile stresses are located at the top of the slab, and are maximized when the two truck axle loads are positioned on the two edges of the slab. This fact is confirmed experimentally; the slab cracks are observed to initiate at the top and develop towards the bottom of the pavement. The review of the three fatigue models shows that the level of tensile stress overcomes the frequency of load application. This is due to the tensile stresses resulting from the built-in negative temperature gradient. For the four pavement sections in the study, 13 ft (4.0 m) slabs had the longest design life.
Download or read book Truck pavement economic Modeling and In situ Field Test Data Analysis Applications written by Shad M. Sargand and published by . This book was released on 2006 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: In current U.S. practice, quality of subgrade in a pavement system is commonly evaluated using the degree of compaction in the field and comparing with the laboratory determined maximum dry density from Standard/Modified Proctor tests (AASHTO T-99/T-180) to confirm the degree of compaction. However density is inherently an indirect measurement of the subgrade quality. This report studies the use of nondestructive testing (NDT) devices, such as the Falling Weight Deflectometer (FWD), to directly and quickly measure subgrade and base stiffness and/or modulus. This study's main objective was assessment of material-specific stiffness and soil modulus of unbound granular soil materials using deflection data from 146 sections in ten states in the nationwide pavement database. In some cases, insufficient or unavailable in-situ soil data were supplemented with laboratory measurements. Calculation of stiffness and soil modulus was based on the linear elastic theory of granular soil material. To achieve high reliability of output results, establishment of the data screening procedures was another major concern in this study. Also, correlations between major engineering properties and stiffness or modulus of unbound granular materials were performed for validation of output results. Statistics for modulus and stiffness of 11 types of subgrade soils are presented, including mean with 95% confidence interval, median, standard deviation, and interquartile range. Similar statistics are given for bases made from aggregate or aggregate mixed with soil. The subgrade modulus is then correlated with various engineering properties, including moisture content, maximum dry density, plasticity index, and grain size distribution. Calculated mean stiffness and modulus values for base materials and coarse-grained soils agreed with typical previously published values, while those for fine-grained soils did not. For coarse-grained soils, modulus increased as moisture decreased, except below a threshold below which soil was too dry and modulus decreased. Well-graded soil had a higher modulus. The correlation analysis showed that for fine-grained soils, modulus was sensitive to the plasticity index, the weighted plasticity index, and number of fines. Stiffness and modulus for coarse-grained soils showed a good agreement and reliable relationship with other soil properties. Measured stiffness and modulus values in the pavement database exceeded the European standards, and all soils had been approved for construction. For practical purposes, subgrade stiffness and soil modulus values at the 25th percentile could be considered as the minimum limiting criteria for AASHTO soil types A-1, A-1-a, A-1-b, A-2-4, and A-2-6. Similarly, base stiffness and base modulus values at the 25% percentile appear to be reasonable as a minimum criterion. A table of values is given.
Download or read book Performance Evaluation of Open Graded Base Course with Doweled and Non doweled Transverse Joints on USH 18 151 STH 29 and USH 151 written by Robert L. Schmitt (Ph.D.) and published by . This book was released on 2010 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Instrumentation of the WAY 30 Test Pavements written by Shad M. Sargand and published by . This book was released on 2008 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: The US Route 30 bypass of Wooster, Ohio, in Wayne County, "WAY-30", was constructed to demonstrate two types of extended service pavements, a long-life Portland cement concrete (PCC) pavement on the eastbound lanes and an asphalt concrete (AC) perpetual pavement on the westbound lanes. Both pavements are designed to provide 50 years or more of service with minimal maintenance (e.g. resurfacing). The PCC pavement structure features a thick and extra-wide slab on an asphalt treated base, while the AC pavement structure features a Superpave surface and a Fatigue Resistant Layer (FRL). Two sections in each direction were instrumented with pressure cells to monitor subgrade pressures and deep and shallow LVDTs to record pavement deflections. The AC test section also had transverse and longitudinal strain gages. A weather station was also used to monitor environmental conditions. Nondestructive testing of the subgrade was conducted prior to pavement placement. Pavement materials and samples were tested in the laboratory to determine material parameters. Controlled vehicle load and falling weight deflectometer tests were applied to the AC pavement shortly after the road opened to traffic in December 2005 and again under hot weather conditions in July 2006. Similar tests on the PCC pavement were conducted in December 2005 and August 2006. The response on both types of pavement met their respective design criteria. A verification analysis of the AC pavement response using the elastic layer system (ELS) simulation using material properties derived from laboratory and field sample data yielded unsatisfactory matches, suggesting that some refinement of the approach is needed
Download or read book Guidelines for Implementing NCHRP 1 37A M E Design Procedures Summary of findings implementation plan and next steps written by and published by . This book was released on 2009 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Guidelines for Implementing NCHRP 1 37A M E Design Procedures Literature review written by and published by . This book was released on 2009 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: Highway agencies across the nation are moving towards implementation of the new AASHTO Mechanistic-Empirical Pavement Design Guide (MEPDG) for pavement design. The benefits of implementing the MEPDG for routine use in Ohio includes (1) achieving more cost effective and reliable pavement designs, (2) lower initial and life cycle costs to the agency, and (3) reduced highway user impact due to lane closures for maintenance and rehabilitation of pavements. Implementation of the MEPDG is a process that requires time and agency resources (staffing, training, testing facilities including equipment, and so on). A key requirement is validating the MEPDG's nationally calibrated pavement distress and smoothness prediction models when applied under Ohio conditions and performing local calibration if needed. Feasibility of using the MEPDG's national models in Ohio was investigated under this study using data from a limited number of LTPP projects located in Ohio. Results based on limited data showed inadequate goodness of fit and significant bias in a number of the MEPDG new HMA pavement and JPCP performance prediction models. Limited recalibration of these models showed promising results indicating that a full-scale recalibration effort using a more extensive database assembled from projects located throughout the state is feasible.
Download or read book Annual Report written by Pennsylvania Transportation Institute and published by . This book was released on 2000 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Accelerated Pavement Testing to Transport Infrastructure Innovation written by Armelle Chabot and published by Springer Nature. This book was released on 2020-08-25 with total page 724 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume gathers the latest advances, innovations, and applications in the field of accelerated pavement testing (APT), presented at the 6th International Conference on Accelerated Pavement Testing, in Nantes, France, in April 2022. Discussing APT, which involves rapid testing of full-scale pavement constructions for structural deterioration, the book covers topics such as APT facilities, APT of asphalt concrete and sustainable/innovative materials, APT for airfield pavements, testing of maintenance and rehabilitation solutions, testing of smart and multi-functional pavements, data analysis and modeling, monitoring and non-destructive testing, and efficient means of calibrating/developing pavement design methods. Featuring peer-reviewed contributions by leading international researchers and engineers, the book is a timely and highly relevant resource for materials scientists and engineers interested in determining the performance of pavement structures during their service life (10+ years) in a few weeks or months.
Download or read book Mechanistic empirical Pavement Design Guide written by American Association of State Highway and Transportation Officials and published by AASHTO. This book was released on 2008 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Annual Report written by Alberta Research Council and published by . This book was released on 1974 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Directory of Computer Software Applications Civil Structural Engineering 1978 September 1980 written by and published by . This book was released on 1981 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1991 with total page 1460 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Download or read book Optimization of Tack Coat for HMA Placement written by Louay Nadhim Mohammad and published by Transportation Research Board. This book was released on 2012 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: TRB’s National Cooperative Highway Research Program (NCHRP) Report 712: Optimization of Tack Coat for HMA Placement presents proposed test methods for measuring the quality and performance characteristics of tack coat in the laboratory and the field, and includes a training manual presenting proposed construction and testing procedures for tack coat materials.
Download or read book EPA Publications Bibliography written by United States. Environmental Protection Agency and published by . This book was released on 2000-07 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Public Roads written by and published by . This book was released on 1970 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
